DESIGN & HANDLING OF HIGH ACTIVITY COLLIMATORS & RING COMPONENTS ON THE SNS*

The Spallation Neutron Source (SNS) accelerator systems will provide a 1GeV, 1.44MW proton beam to a liquid mercury target for pulsed neutron production. The expected highest doses to components are in the collimator regions. This paper presents the mechanical engineering design of a typical collimator highlighting the design features incorporated to assist with removal once it is activated. These features include shielding and lifting fixtures but more importantly a double contained flexible water system incorporating remote water couplings. Also presented is a mechanism that allows axial movement of vacuum bellows and its associated vacuum clamps. Much design work is now focused on other areas of the storage ring and a status of this work is included